I have a couple of users that claim they lose internet connectivity for multiple short periods through the day. I am not aware of a way that I can monitor internet ISP uptime to my domain with out a call to them and they view their log file to the cable modem. In the past when I have done this they always say they have not had any down time.

These users all run through the same router as the rest of the users and others do not see this issue. I have tried to rule out everything alse so wondered if there is a way to be able to monitor it by IP for connectivity?

If the cable router has a public IP Address and you can setup a SNMP on it you can use a tool like MRTG to do traffic monitoring and that way you can see if you ever have a dip in traffic or an outage and keep tabs on it that way.

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If the cable router has a public IP Address and you can setup a SNMP on it you can use a tool like MRTG to do traffic monitoring and that way you can see if you ever have a dip in traffic or an outage and keep tabs on it that way.